/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.ctakes.temporal.ae.feature;
import java.util.Collection;
import java.util.List;
import org.apache.ctakes.typesystem.type.syntax.BaseToken;
import org.apache.ctakes.typesystem.type.textsem.Predicate;
import org.apache.ctakes.typesystem.type.textsem.SemanticArgument;
import org.apache.ctakes.typesystem.type.textsem.SemanticRoleRelation;
import org.apache.uima.jcas.JCas;
import org.cleartk.classifier.Feature;
import org.uimafit.util.JCasUtil;
import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.Lists;
import com.google.common.collect.Multimap;
public class PredicateArgumentExtractor {
private Multimap<BaseToken, Predicate> tokenPredicateMap;
private Multimap<BaseToken, SemanticArgument> tokenArgumentMap;
public PredicateArgumentExtractor(JCas jCas) {
this.tokenPredicateMap = ArrayListMultimap.create();
for (Predicate predicate : JCasUtil.select(jCas, Predicate.class)) {
for (BaseToken token : JCasUtil.selectCovered(jCas, BaseToken.class, predicate)) {
this.tokenPredicateMap.put(token, predicate);
}
}
this.tokenArgumentMap = ArrayListMultimap.create();
for (SemanticArgument argument : JCasUtil.select(jCas, SemanticArgument.class)) {
for (BaseToken token : JCasUtil.selectCovered(jCas, BaseToken.class, argument)) {
this.tokenArgumentMap.put(token, argument);
}
}
}
public List<Feature> extract(BaseToken token) {
List<Feature> features = Lists.newArrayList();
Collection<Predicate> predicates = this.tokenPredicateMap.get(token);
features.add(new Feature("Predicate", !predicates.isEmpty()));
for (Predicate predicate : predicates) {
features.add(new Feature("Predicate_Lex", predicate.getCoveredText()));
}
for (SemanticArgument argument : this.tokenArgumentMap.get(token)) {
SemanticRoleRelation relation = argument.getRelation();
String category = relation.getCategory();
features.add(new Feature("Argument", category));
String predicateText = relation.getPredicate().getCoveredText();
features.add(new Feature("Argument_Lex", String.format("%s_%s", category, predicateText)));
}
return features;
}
}